Draw a circuit consisting of two transformers, one labeled HV, the other labeled Filament, and two double pole switches that will allow only the Filament transformer to be turned "ON" first and the HV transformer last and allowing only the HV transformer to be turned OFF first and then the Filaments last. The switches are labeled as S1 and S2. This may be simpler than it is stated.
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In other words, it does not matter in which order the two switches are thrown, the filaments come on first, followed by High Voltage, and High-Voltage will turn off first and then Filaments last.|dw:1440262119437:dw|
I realize this is for old vacuum tube type equipment, but might be challenge as no microprocessors required! lol
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|dw:1440262902742:dw| There I have completed one side of the line circuitry.
|dw:1440263002342:dw| A more accurate depiction of the double pole switches.
One more connection remaining.
The most fun will be to verify it.
Is this it?
|dw:1440331574084:dw| Here is the completed circuit.
Note if S2 is the first one closed, only the filament transformer is connected to the line source. Now if S1 is closed, (while S2 is closed) the HV transformer is now connected to the source as well as the Filament. Now if either switch is opened only the HV transformer is removed from the line source, and if the remaining switch is then opened the filaments will be turned off.
This circuit was from the Aug. 2015 Issue which was a reprint from the Sep. 1956 issue (the year I graduated from high school lol0
i actually get that.
Although I understood what was wanted, I could not believe that it could be achieved with just 2 double pole switches. So I had to look at the solution. I am thinking of trying to use a logic table and see if I could do it with logic gates (inverter, AND, or OR)
Whose photo is that in your avatar?
hi @radar. nice thread.
that's Andy Kaufman.
i might have Tesla next time round :-)
Nice one..... it took me time to understand..... :)
@arindameducationusc Thanks, @IrishBoy123 Tesla never got the credit he deserved in development of radio.
thats true... @radar
its really sad.
He was one of the best scientist of all time.